Last year we ran a couple of fun debates here on the forums. First up, [Matt and Luke had a fight to the death (as I like to call it). Then Angela Schmeidel Randall took on Donna Spencer in a raging debate over up-front user research(http://community.uxmastery.com/forum/news/1040-debate-1-usability-vs-delight). Both debates were fantastic, and then we took a break.
Now I've managed to lure in a new pair of challengers, and it's going to be epic. I'll let you know who they are once the excitement that is World IA Day is over.
In the mean time, let's start brainstorming subjects. Is there anything UX related that you'd love to see two people go head to head over?